Standard
Adjustment
(34) Adjusting
the
top feed dog pressure
<Standard height
of
top presser adjusting screw>
Dimension A
Vertical
amount
of
Max.
top
feed
dog
sewing
speed
MO-6900R
24to25mm
Less
than
6.5mm
7,000rpm
20.5
to
21.5mm
6.Sto8.5mm
7,000rpm
MO-6900J
20.5
to
21.5mm
8.5mm
6,000rpm
1.
Standard
is
the position where the top feed dog stops jumping and,
when
further the screw
is
tightened, sound becomes quiet and
is
stabilized when gradually tightening the screw
from
the
lower pressure.
Besides, when using the top
feed
dog
making low the top
feed
dog
pressure, decrease the vertical
amount of the
top
feed dog or decrease the sewing speed.
2.
Dimensions listed
in
the list are slightly increased values that
can
be guaranteed
even
when
the
vertical amount of top
feed
dog and sewing speed are
in
the most strict combination
in
the list.
Accordingly, when using the machine
by
decreasing the vertical amount of the top feed dog or
decreasing the sewing speed, use it with rather large value (top feed dog pressure
is
low)
than
dimensions A
in
the list.
(35) Lifting amount
of
the top feed dog (when operating the pedal)
The height
of
the top feed
dog
from the
top
surface
of
the
throat plate when
the
pedal is depressed at
the lowest point of
the
needle bar and
the
top
feed
dog goes
up
to
the highest point is 9 ± 0.5
mm.
In
case
of MO-6900J, the height
is
10.5 ±
0.5
mm.
-56
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